667429 has 12 divisors (see below), whose sum is σ = 794124. Its totient is φ = 559104.

The previous prime is 667427. The next prime is 667441. The reversal of 667429 is 924766.

667429 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 592900 + 74529 = 770^2 + 273^2 .

It is not a de Polignac number, because 667429 - 2¹ = 667427 is a prime.

It is a super-2 number, since 2×667429² = 890922940082, which contains 22 as substring.

It is a Duffinian number.

Its product of digits (18144) is a multiple of the sum of its prime factors (324).

It is a junction number, because it is equal to n+sod(n) for n = 667394 and 667403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2469 + ... + 2725.

It is an arithmetic number, because the mean of its divisors is an integer number (66177).

2⁶⁶⁷⁴²⁹ is an apocalyptic number.

It is an amenable number.

667429 is a deficient number, since it is larger than the sum of its proper divisors (126695).

667429 is a wasteful number, since it uses less digits than its factorization.

667429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324 (or 317 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 667429 is about 816.9632794685. The cubic root of 667429 is about 87.3913317650.

The spelling of 667429 in words is "six hundred sixty-seven thousand, four hundred twenty-nine".